CHIEFTED  Have been using this for a couple of weeks and haven't had an issue with it. Even the beta 4.0 version for Snow Leopard works well.

I didn't install APE though since it is only used to block some

resolutions.

Without APE it works just fine.

Yes wouldn't install APE if you paid me and as a former Mac

Genius if APE is install that is the first thing a Genius

will have you uninstall if something goes wrong.  
(Version 3.8.7)

XENOPHILE  This might actually be useful if it could store "sets" containing both resolution settings and colorsync profiles.

For now I'll just keep using Apple's menu item to switch resolutions. Nice try, though.  
(Version 3.8.6)

VERYVITO  How does this offer anything different from the "Show displays in Menu bar" setting already in the Displays Preference panel?  
(Version 3.8.6)

XENOPHILE  APE is a system hack that is unsupported by Apple, meaning that it mucks with system-level internals in ways that Apple does condone, and more importantly, ways that Apple has not rigorously tested.

To be fair, there is some controversy among geeks who know vastly more than I about OS X as to whether APE destabilizes OSX. So when you're up against a deadline, or you've labored for hours on a complex project since last backing it up, if it gives you a nice warm fuzzy feeling to contemplate a few OS X gurus arguing whether APE destabilizes your system or not, then go ahead and use APE. Me? I don't trust APE any further than I could throw a real ape.  
(Version 3.8.5)

REVCO  Huh? What wrong with APE? Me APEd for many years with no problem. Don't point finger at APE. APE good not bad.  
(Version 3.8.2)

XENOPHILE  Avoid.

Unsanity APE is an unsupported hack that accesses Mac OS X processes that Apple has delcared off limits. All too often, I've identified APE as a cause of system instability or application weirdness when troubleshooting Macs. Any potential user of APE needs to ask themselves if they really need the functionality it enables, and if so, can they afford extra system down time as the price for this functionality?   
(Version 3.8.2)

MACINSPORE  This software is downright dangerous and insane. Based on my testing you have a very high likelihood of getting an "out of range" error and the loss of your display. Recovery from this problem is NOT simple.

1st Reboot you Mac and hold down the command, option, p and r keys. If your lucky this will fix things (it did not for me)

2nd find another monitor, plug it in and reboot. This fixed things things on a G3 running Jaguar.

3rd hold down the option and S keys while rebooting your Mac and delete the "com.apple.windowserver.XXXXX.plist" exist file in your own /Users/yourname/Library/Preferences/ByHost folder. Time to test your knowledge of UNIX and the "rm" command

But if this does not do the trick for you perhaps you could buy a new Mac or pay the Author, he claims he will try to help :-)

I tried this software on 3 Macs and got the same error: two Intel Macs (Tiger and Leopard) and a G3 tower (Jaguar) (1 Compaq Monitor, 1 HP Monitor 1 Apple Studio Display)

And yes I love too test software for the Mac, been doing so for over ten years. This software made me work hard to recover the display in each case.

the Author seems to be a good fellow and has been around the Mac OS for years (probably longer than I have and thats a long time) - but frankly this software is not ready for prime time on the Mac OS X  
(Version 3.8)

SMTIPS  Oh MAN!! I was just about to get this because for some stupid reason I can only get a 60Hz refresh rate through the Displays panel when my monitor supports 75Hz. I think it's stupid that a mac with a 256 Nvidia card will only show a single refresh rate available when the monitor will support higher. It's ALWAYS been a problem with Macs way back since System 7 that the res/refresh rates that COULD be supported weren't selectable in the system...DUHHHH on you apple!!

Anyway....Unsanity APE has been known to cause FAR FAR too many issues. I refuse to use it, and you just lost my money...I was all ready to buy this til I saw the below comment...forget that APE CRAP.  
(Version 3.7.11)

JAMESKITTY  Requires Unsanity's APE hack. I won't install it.

Too bad the author can't find a way of programming this within Apple's rules.  
(Version 3.7.10)

APPLECRYPT MODS  i wish the interface was better, but you had my reg money a while back and now it even works on intel mac!! Xcellent!  
(Version 3.7.2)